WO2016119241A1 - Procédé et terminal d'émission de données pour communication d2d - Google Patents

Procédé et terminal d'émission de données pour communication d2d Download PDF

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Publication number
WO2016119241A1
WO2016119241A1 PCT/CN2015/072015 CN2015072015W WO2016119241A1 WO 2016119241 A1 WO2016119241 A1 WO 2016119241A1 CN 2015072015 W CN2015072015 W CN 2015072015W WO 2016119241 A1 WO2016119241 A1 WO 2016119241A1
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WO
WIPO (PCT)
Prior art keywords
terminal
tai
parameter
bits occupied
data
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PCT/CN2015/072015
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English (en)
Chinese (zh)
Inventor
吴海
王键
刘德平
赵越
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华为技术有限公司
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Priority to PCT/CN2015/072015 priority Critical patent/WO2016119241A1/fr
Priority to CN201580002195.6A priority patent/CN106105294B/zh
Publication of WO2016119241A1 publication Critical patent/WO2016119241A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Definitions

  • the embodiments of the present invention relate to the field of communications, and in particular, to a data transmission method and terminal for D2D communication.
  • LTE Long Term Evolution
  • UE User Equipment
  • eNB evolved Node B
  • the data exchange between UEs does not need to be forwarded through the eNB, and can be directly interacted between UEs or in the direct communication communication (ie, Device to Device, D2D for short). Direct interaction with the help of the network.
  • network coverage full name: in-network-coverage
  • no network coverage full name: out-of-network-coverage
  • partial network coverage full name: in-partial-network- Coverag
  • the D2D communication refers to a terminal sending a scheduling allocation (full name: Scheduling Assignment, abbreviated as SA) information and data, and other terminals obtain the information occupied by the data indicated by the SA, the transmission format, and the like by reading the SA information, thereby correctly receiving the subsequent information.
  • SA Scheduling Assignment
  • the eNB or the relay node scheduling terminal is used to transmit the data of the direct communication communication and the control information, and is applied to the scenario of network coverage or partial network coverage.
  • the base station indicates, by using the downlink signaling, information such as resources and formats for transmitting the scheduling data by the D2D transmitting UE (hereinafter referred to as the transmitting UE).
  • the transmitting UE first sends a Sidelink Control Information (SCI) to the D2D receiving UE (hereinafter referred to as the simple receiving UE) through the Physical Sidelink Control Channel (PSCCH), and then transmits the UE according to the SCI.
  • SCI Sidelink Control Information
  • PSCCH Physical Sidelink Control Channel
  • Within The D2D data is transmitted on the Physical Sidelink Share Channel (PSSCH).
  • PSSCH Physical Sidelink Share Channel
  • the uplink transmission of the LTE system for different UEs served by the same base station, since the UEs are in different geographical locations, the distances from the base stations are different, so that the signals transmitted by the UEs at these different locations can reach the base station at the same time.
  • N TA timing advance this value can be used to determine an uplink signal transmission time advance: N TA ⁇ Ts, referred to uplink timing, wherein the value of N TA 0 ⁇ N TA ⁇ 20512, Ts is the basic time Basic time unit,
  • the UE When performing uplink transmission, the UE performs early transmission by using downlink timing and uplink timing, wherein the downlink timing is obtained by the UE by detecting a synchronization channel and a pilot signal of the base station.
  • the transmitting UE will use the uplink timing when transmitting the PSSCH, and the transmitting UE needs to notify the receiving UE of the uplink timing adopted by the UE in advance.
  • the transmitting UE notifies the receiving UE of the uplink used by the receiving UE through the PSCCH.
  • the uplink timing is represented as N TA ⁇ Ts, and Ts is a fixed value, the transmitting UE only needs to notify the receiving UE of the time advance parameter N TA , and the existing protocol stipulates that at most only 6 can be reserved in the PSCCH.
  • the number of bits can be used for bearer, and 0 ⁇ N TA ⁇ 20512, that is, N TA needs to use 15 bits to accurately notify, so the number of bearers in the PSCCH in the existing protocol cannot meet the requirement of the time advance parameter N TA .
  • the value of N TA is segmented and a time advance indication parameter I TAI corresponding to each N TA of the segment is given according to each segment value range of the N TA , for example, at 0 ⁇ N TA ⁇ 20,512 in the case of the N TA is divided into 42 sections, each corresponding to a TAI of I, respectively, each memory segment corresponding to I N TA TAI of the UE transmitting and receiving UE, the UE only needs to transmit a parameter indicating the timing advance I
  • the TAI is sent to the receiving UE through the PSCCH.
  • the receiving UE Since the value interval of the I TAI is [0, 41], the range of the number of bearable bits of the PSCCH is not exceeded, and after receiving the I TAI , the receiving UE acquires the transmission according to the received I TAI .
  • N TA segmentation limit adopted by the UE the UE receives through N TA range of the acquired segment received PSSCH transmitting UE, in which case, the UE can not accurately know the reception transmitting UE uses the value N TA sizes, but only to obtain For an N TA segment range, the receiving UE can only receive according to the maximum possible N TA value.
  • the range of uplink timing that may be used is [256,767] ⁇ Ts, which means that the actual signal arriving at the receiving window may be delayed by 512 ⁇ Ts. In the case of such a large signal delay, the reception timing error of the UE is large, which affects the reception performance of the PSSCH.
  • the embodiment of the invention provides a data transmission method and a terminal for D2D communication, which can reduce the receiving error of the receiving UE transmitting D2D data to the transmitting UE.
  • an embodiment of the present invention provides a data transmission method for D2D communication, including:
  • the first D2D terminal acquires the I TAI and D2D data transmission advance parameter TA′ according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA ;
  • the first D2D terminal acquires the I TAI and D2D data according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA Send the advance parameter TA', including:
  • the first D2D terminal acquires the number of bits occupied by the I TAI and the N TA said I TAI, and the maximum number of bits of the I TAI and the N TA occupied by acquiring the TA ', or The minimum value of the segment range in which the N TA is located is taken as the acquired TA'.
  • the first D2D terminal indicates the number of bits and time occupied by the parameter I TAI according to the time advance
  • the advance parameter N TA acquires the I TAI and D2D data transmission advance parameter TA', including:
  • the terminal according to the first D2D N TA query I TAI corresponding to said number of bits occupied by different tables, to give the corresponding N TA said I TAI and the TA '.
  • the first D2D terminal acquires the number according to the number of bits occupied by the I TAI and the N TA I TAI , including:
  • the first D2D terminal calculates the I TAI by :
  • the N is the maximum number of bits occupied by the N TA
  • the x is the number of bits occupied by the I TAI ;
  • the first D2D terminal calculates the TA' by:
  • the N is the maximum number of bits occupied by the N TA
  • the x is the number of bits occupied by the I TAI .
  • the first D2D terminal acquires the number according to the number of bits occupied by the I TAI and the N TA I TAI , including:
  • the first D2D terminal calculates the I TAI by :
  • the N is the maximum number of bits occupied by the N TA
  • the x is the number of bits occupied by the I TAI
  • the Y is a preset time advance adjustment parameter
  • the first D2D terminal calculates the TA' by:
  • the N is the maximum number of bits occupied by the N TA
  • the x is the number of bits occupied by the I TAI
  • the Y is a preset time advance adjustment parameter.
  • the Y ranges from 0 to 511.
  • the number of bits occupied by the I TAI is 6 bits.
  • the seventh aspect in the first aspect In a possible implementation manner, there is a one-to-one correspondence between the I TAI and the TA′.
  • the method further comprising: said first terminal acquires the base station allocates D2D the D2D N TA to the first terminal from the base station.
  • the first D2D terminal sends the D2D data to the second D2D terminal according to the TA′ and the basic time unit Ts, including:
  • the first D2D terminal calculates a D2D data transmission time advance amount according to the TA' and the Ts as TA' ⁇ Ts;
  • the first D2D terminal transmits D2D data to the second D2D terminal through the physical side row shared channel PSSCH according to the TA′ ⁇ Ts.
  • the embodiment of the present invention further provides a data transmission method for D2D communication, including:
  • the second D2D terminal receives the time advance indication parameter I TAI sent by the first D2D terminal through the physical side control channel PSCCH;
  • the second D2D terminal acquires a D2D data transmission advance parameter TA' according to the received I TAI ;
  • the second D2D terminal receives the D2D data sent by the first D2D terminal according to the acquired TA' and the basic time unit Ts.
  • the second D2D terminal acquires the D2D data sending advance parameter TA′ according to the received I TAI , including:
  • the second D2D terminal calculates the TA' by:
  • the N is the maximum number of bits occupied by the time advance parameter N TA
  • the x is the number of bits occupied by the I TAI .
  • the second D2D terminal acquires the D2D data transmission advance parameter TA′ according to the received I TAI , including:
  • the second D2D terminal calculates the TA' by:
  • the N is the maximum number of bits occupied by the time advance parameter N TA
  • the x is the number of bits occupied by the I TAI
  • the Y is a preset time advance adjustment parameter.
  • the Y ranges from 0 to 511.
  • the x is 6 bits.
  • the second D2D terminal acquires the D2D data transmission advance parameter TA′ according to the received I TAI , including:
  • the second D2D terminal queries the corresponding table when the I TAI occupies a different number of bits according to the I TAI , and obtains the TA′ corresponding to the I TAI ; or
  • D2D to the second terminal acquires the I TAI segment corresponding to the range N TA, and using a minimum value of the range of the segment is located as N TA to the acquired TA '.
  • the second D2D terminal In combination with the second aspect or the first possible or second possible or third possible or the fourth possible or the fifth possible possible implementation of the second aspect, in a sixth possible implementation of the second aspect
  • the receiving, by the second D2D terminal, the D2D data sent by the first D2D terminal according to the acquired TA' and the basic time unit Ts including:
  • the second D2D terminal calculates a D2D data transmission time advance amount according to the TA' and the basic time unit Ts as TA' ⁇ Ts;
  • the second D2D terminal receives the D2D data sent by the first D2D terminal by using the physical side row shared channel PSSCH according to the TA′ ⁇ Ts.
  • an embodiment of the present invention further provides a data transmission method for D2D communication, including:
  • D2D terminal obtains a first timing advance parameter is less than the value of N TA timing advance parameter indicates the number of bits occupied by I TAI according to the timing advance parameter is less than the value of the acquired N TA I TAI;
  • D2D the first terminal to the second transmission I TAI D2D side terminal through a physical downlink control channels PSCCH, the D2D I TAI for the second terminal I TAI acquiring range where the N TA;
  • Ts D2D terminal transmits the first data to the second D2D D2D N TA and the terminal according to the basic time unit, so that the second range D2D terminal according to the acquired location and the N TA The Ts receives the D2D data sent by the first D2D terminal.
  • the first D2D terminal acquires the I TAI according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA , including:
  • the first D2D terminal calculates the I TAI by :
  • the x is the number of bits occupied by the I TAI
  • the Z is a preset time adjustment parameter.
  • the first D2D terminal acquires the I TAI according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA , including:
  • the first D2D terminal calculates the operation intermediate amount N TA ' as follows:
  • N TA ' mod(N TA , 2 Z ),
  • the Z is a preset time adjustment parameter
  • the first D2D terminal calculates the I TAI by :
  • the x is the number of bits occupied by the I TAI
  • the Z is a preset time adjustment parameter.
  • the value of Z ranges from 1 to 14.
  • the number of bits occupied by the I TAI is 6 bits.
  • the embodiment of the present invention further provides a data transmission method for D2D communication, including:
  • the second D2D terminal receives the time advance indication parameter I TAI sent by the first D2D terminal through the physical side control channel PSCCH;
  • the second D2D terminal receives the D2D data sent by the first D2D terminal according to the obtained value range and the basic time unit Ts where the NTA is located.
  • the second D2D terminal acquires a time advance parameter N according to the received I TAI
  • the range of values for the TA including:
  • the second D2D terminal calculates a value range in which the operation intermediate amount N TA ' is
  • the second D2D terminal calculates that the value range of the N TA is
  • the M is obtained by using a demodulation reference signal DMRS of the PSSCH.
  • the embodiment of the present invention further provides a D2D terminal, where the D2D terminal is specifically a first D2D terminal, and includes:
  • An acquiring module configured to acquire the I TAI and D2D data transmission advance parameter TA′ according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA ;
  • a notification module configured to send the I TAI to the second D2D terminal by using a physical side control channel PSCCH, so that the second D2D terminal acquires the TA′ according to the received I TAI ;
  • a data sending module configured to send D2D data to the second D2D terminal according to the TA′ and the basic time unit Ts, so that the second D2D terminal receives the according to the acquired TA′ and the Ts D2D data sent by the first D2D terminal.
  • the obtaining module is configured to obtain the I TAI the number of bits occupied by the I TAI and the N TA, and uses the The maximum number of bits occupied by the I TAI and the N TA acquires the TA′, or uses the minimum value of the segment range in which the N TA is located as the acquired TA′.
  • the acquiring module is specifically configured to query the I TAI occupation according to the N TA
  • the table corresponding to the number of bits obtains the I TAI and the TA' corresponding to the N TA .
  • the acquiring module is specifically configured to calculate the I TAI by :
  • the acquiring module is specifically configured to calculate the I TAI by :
  • the TA' is calculated by:
  • the N is the maximum number of bits occupied by the N TA
  • the x is the number of bits occupied by the I TAI
  • the Y is a preset time advance adjustment parameter.
  • the Y ranges from 0 to 511.
  • the number of bits occupied by the I TAI is 6 bits.
  • the seventh in the fifth aspect In combination with the fifth or fifth aspect, the first possible or the second possible or the third possible or the fourth possible or the fifth possible or the sixth possible possible implementation, the seventh in the fifth aspect In a possible implementation manner, there is a one-to-one correspondence between the I TAI and the TA′.
  • the acquiring module is further configured to acquire the base station allocates the first D2D N TA to the terminal from the base station.
  • the data sending module includes:
  • a calculation submodule configured for the first D2D terminal to calculate a D2D data transmission time advance according to the TA′ and the Ts as TA′ ⁇ Ts;
  • a sending submodule configured to send D2D data to the second D2D terminal by using the physical side row shared channel PSSCH according to the TA′ ⁇ Ts.
  • the embodiment of the present invention further provides a D2D terminal, where the D2D terminal is specifically a second D2D terminal, and includes:
  • An information receiving module configured to receive, by using a physical side-line control channel PSCCH, a time advance indication parameter I TAI sent by the first D2D terminal;
  • An obtaining module configured to acquire a D2D data sending advance parameter TA′ according to the received I TAI ;
  • the data receiving module is configured to receive the D2D data sent by the first D2D terminal according to the acquired TA′ and the basic time unit Ts.
  • the acquiring module is specifically configured to calculate the TA′ by:
  • the N is the maximum number of bits occupied by the time advance parameter N TA
  • the x is the number of bits occupied by the I TAI .
  • the acquiring module is specifically configured to calculate the TA′ by:
  • the N is the maximum number of bits occupied by the time advance parameter N TA
  • the x is the number of bits occupied by the I TAI
  • the Y is a preset time advance adjustment parameter.
  • the Y ranges from 0 to 511.
  • the x is 6 bits.
  • the acquiring module is specifically configured to: according to the I TAI, query a table corresponding to when the I TAI occupies a different number of bits, to obtain the I corresponding to the TAI TA '; or, acquired range of the segment corresponding to the I N TA TAI, and using a minimum value of the range of the segment N as the TA where TA acquired'.
  • the data receiving module includes:
  • a calculation submodule configured to calculate, according to the TA′ and the basic time unit Ts, a D2D data transmission time advance amount is TA′ ⁇ Ts;
  • the receiving submodule is configured to receive the D2D data sent by the first D2D terminal by using the physical side row shared channel PSSCH according to the TA′ ⁇ Ts.
  • the embodiment of the present invention provides a D2D terminal, where the D2D terminal is specifically a first D2D terminal, and includes:
  • the timing advance parameter I TAI indicating the number of bits occupied by the timing advance parameter is less than the value N TA I TAI according to the acquired;
  • a notification module configured to send the I TAI to the second D2D terminal by using a physical side control channel PSCCH, where the I TAI is used by the second D2D terminal to obtain a value range in which the N TA is located;
  • Data transmitting means for transmitting Ts D2D D2D data to the second terminal according to the N TA and the basic time unit, so that the second range D2D terminal according to the acquired location and the N TA The Ts receives the D2D data sent by the first D2D terminal.
  • the acquiring module is specifically configured to calculate the I TAI by :
  • the x is the number of bits occupied by the I TAI
  • the Z is a preset time adjustment parameter.
  • the value of Z ranges from 1 to 14.
  • the number of bits occupied by the I TAI is 6 bits.
  • the embodiment of the present invention provides a D2D terminal, where the D2D terminal is specifically a second D2D terminal, and includes:
  • An information receiving module configured to receive, by using a physical side-line control channel PSCCH, a time advance indication parameter I TAI sent by the first D2D terminal;
  • An obtaining module configured to acquire, according to the received I TAI, a value range in which the time advance parameter N TA is located;
  • the data receiving module is configured to receive the D2D data sent by the first D2D terminal according to the obtained value range and the basic time unit Ts where the NTA is located.
  • the acquiring module is configured to receive, by using the physical side row shared channel PSSCH, the value of the N TA by multiplying the Ts by the Ts The D2D data sent by the first D2D terminal.
  • the acquiring module is specifically configured to calculate an operation intermediate quantity N TA '
  • the range of values is N TA ' ⁇ [I TAI ⁇ 2 Zx ,(I TAI +1) ⁇ 2 Zx -1]:
  • the acquiring module is further configured to obtain, by using the demodulation reference signal DMRS of the PSSCH, the M .
  • the first D2D terminal acquires the I TAI and D2D data transmission advance parameter TA′ according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA , and the first D2D terminal sends the I TAI to the I TAI through the PSCCH.
  • the second D2D terminal acquires TA′ according to the received I TAI , the first D2D terminal sends D2D data to the second D2D terminal according to the TA′ and the basic time unit Ts, and the second D2D terminal according to the acquired TA′ And the Ts receives the D2D data sent by the first D2D terminal, because the second D2D terminal can receive the I TAI sent by the first D2D terminal and acquires TA′ according to the I TAI , and the first D2D terminal sends the D2D data by using TA′ and Ts.
  • the second D2D terminal can also accurately know the D2D data transmission time advance of the first D2D terminal according to TA' and Ts, and the receiving window of the second D2D terminal can be completely consistent with the D2D data actually sent by the first D2D terminal, thereby The second D2D terminal can accurately receive the D2D data.
  • FIG. 1 is a schematic block diagram of a data transmission method for D2D communication according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a networking architecture of a D2D communication mode 1 according to an embodiment of the present invention
  • FIG. 3 is a timing diagram of transmitting D2D data by a first D2D terminal according to an embodiment of the present invention
  • FIG. 4 is a schematic block diagram showing another method for transmitting data of D2D communication according to an embodiment of the present invention.
  • FIG. 5 is a schematic block diagram of another data transmission method for D2D communication according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic block diagram of another data transmission method for D2D communication according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic flowchart of interaction between a first D2D terminal, a second D2D terminal, and a base station according to an embodiment of the present invention
  • FIG. 8 is a schematic structural diagram of a D2D terminal according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of another D2D terminal according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of another D2D terminal according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic structural diagram of another D2D terminal according to an embodiment of the present disclosure.
  • FIG. 12 is a schematic structural diagram of another D2D terminal according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic structural diagram of another D2D terminal according to an embodiment of the present invention.
  • the embodiment of the invention provides a data transmission method and a terminal for D2D communication, which realizes accurate reception of the D2D data sent by the receiving UE to the transmitting UE.
  • An embodiment of the data transmission method of the D2D communication of the present invention is applicable to the first D2D terminal.
  • the data transmission method of the D2D communication provided by the embodiment of the present invention may specifically include the following steps:
  • the first D2D terminal acquires the I TAI and D2D data transmission advance parameter TA′ according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA .
  • the first D2D terminal is taken as a transmitting UE as an example.
  • the first D2D terminal first obtains a time advance parameter, and the parameter is represented by N TA , in some embodiments of the present invention.
  • step 101 performs data transmission according to the present invention
  • D2D communication method may further comprise the steps of: obtaining a first base station allocates D2D terminal from a first base station to the terminal D2D N TA.
  • the eNB or the relay node scheduling terminal is used to transmit the data of the direct communication communication and the control information, and is applied to the network coverage or part of the network coverage scenario, and the base station gives each D2D.
  • the terminal configuration time advance parameter N TA , N TA takes a value of 0 ⁇ N TA ⁇ 20512.
  • the first D2D terminal is limited by the limitation of the number of bits that can be carried by the PSCCH, and the first D2D terminal needs to transmit by using another parameter that is less than the number of bits occupied by the N TA , for example, using the time advance indication.
  • the parameter is represented by I TAI .
  • the number of bits occupied by the I TAI is less than the number of bits occupied by the N TA .
  • N TA parameter acquired in advance for example, N TA values given segment to segment according to each range segment of each of N TA N TA corresponding to a I TAI, for example 0 ⁇ N TA ⁇ 20512 the case, the N TA is divided into 42 sections, each corresponding to a I TAI, are stored in the respective segments corresponding to N TA I TAI UE transmit and receive at the UE.
  • the first D2D terminal acquires the I TAI to indicate to the second D2D terminal, the D2D data transmission time advance information used by the first D2D terminal, and the D2D data transmission time adopted by the transmitting UE in the embodiment of the present invention.
  • the advance amount is modified, and the N TA is no longer used, but the D2D data is used to transmit the advance parameter, which is represented by TA', and TA' can be obtained by the number of bits occupied by the I TAI and the time advance parameter N TA .
  • the first D2D terminal has multiple manners according to the number of bits occupied by the I TAI and the N TA to acquire the I TAI and the TA′.
  • an implementable manner is that the first D2D terminal is According to the N TA query I TAI takes the corresponding table when the number of bits is different, and obtains the I TAI and TA ' corresponding to the N TA .
  • Further implementations are possible that, after obtaining the first terminal D2D N TA, in the manner provided for D2D communication in the size of the segment N TA value by the acquired N TA can be determined that the N TA where For the segmentation range, TA' can take the minimum value of the segment range in which the N TA is located.
  • N TA ranges given segment respectively corresponding to each of N TA I TAI and a TA '
  • N TA can be divided into 42 segments,
  • Each segment corresponds to one I TAI and TA′
  • the I TAI and TA′ corresponding to each N TA of the segment are respectively stored in the transmitting UE and the receiving UE, where the value of TA′ is the segment range in which the I TAI corresponds to the N TA .
  • the minimum value is taken as an example of the table in which the I TAI occupies different 6 bits, and the following table 1 is obtained.
  • the segment where the N TA is located The range is 256 ⁇ N TA ⁇ 767, and the minimum value of the segment range is 256, so the TA' obtained by the first D2D terminal is 256.
  • Table 1 A side-receive timing adjustment indication mapping table
  • the step 101, the first D2D terminal acquires the I TAI and TA′ according to the number of bits occupied by the I TAI and the N TA may include the following steps: the number of bits occupied by the first D2D terminal according to the I TAI and the N
  • the TA acquires I TAI and obtains TA' using the maximum number of bits occupied by I TAI and N TA .
  • the number of bits occupied by I TAI I TAI is the number of bits occupied by the terminal is transmitted to the second D2D
  • the maximum number of bits occupied by N TA N TA is the number of bits required for the value of the maximum occupancy.
  • I TAI occupied bits than the maximum number of bits occupied by the N TA, using N TA may be determined only one I TAI, determined after I TAI, I TAI and the maximum number of bits occupied by the N TA can be determined using the determined TA', the TA' is used by the first D2D terminal for the transmission of D2D data.
  • the first D2D terminal acquires the I TAI according to the number of bits occupied by the I TAI and the N TA , including:
  • the first D2D terminal calculates the I TAI by :
  • N is the maximum number of bits occupied by the N TA
  • x is the number of bits occupied by the I TAI .
  • N can be 15 or other values, which is determined by the implementation scenario.
  • x can be 6 or other values, which is determined by the implementation scenario.
  • TA' the maximum number of bits occupied by I TAI and N TA is used to obtain TA', including:
  • the first D2D terminal calculates TA' by:
  • N is the maximum number of bits occupied by the N TA
  • x is the number of bits occupied by the I TAI .
  • the first D2D terminal acquires the I TAI according to the number of bits occupied by the I TAI and the N TA , including:
  • the first D2D terminal calculates the I TAI by :
  • N is the maximum number of bits occupied by the N TA
  • x is the number of bits occupied by the I TAI
  • Y is a preset time advance adjustment parameter.
  • the value of N may be 15 or other values, which is determined by the implementation scenario, and the value of x may be 6 or other values, which is determined by the implementation scenario.
  • Y is used as a time adjustment parameter to adjust the value of N TA .
  • the value of Y ranges from 0 to 511.
  • the value of Y can also be selected according to the specific application scenario. Not limited.
  • TA' the maximum number of bits occupied by I TAI and N TA is used to obtain TA', including:
  • the first D2D terminal calculates TA' by:
  • N is the maximum number of bits occupied by the N TA
  • x is the number of bits occupied by the I TAI
  • Y is a preset time advance adjustment parameter.
  • the acquired I TAI and TA 'after, for I TAI and TA' exists between one relationship, the calculation of TA 'I TAI can be directly obtained.
  • the calculation of TA′ may be performed by using other known fixed values in addition to the use of I TAI or Other variable functions existing in D2D communication are obtained, which are not limited herein.
  • the first D2D terminal sends the I TAI to the second D2D terminal through the PSCCH, so that the second D2D terminal acquires the TA′ according to the received I TAI .
  • the first D2D terminal after the first D2D terminal acquires the I TAI , the first D2D terminal sends the I TAI to the second D2D terminal through the PSCCH.
  • the number of bits occupied by the I TAI does not exceed the bit that can be carried by the PSCCH.
  • the number range the first D2D terminal can complete the notification of the I TAI through the PSCCH, so after the second D2D terminal receives the I TAI as the receiving UE, the TA D′ can be obtained in the same manner as the first D2D terminal, and the second D2D terminal can Obtaining the TA' used by the first D2D terminal to transmit the D2D data.
  • the TA' is an accurate and unique value, and is not an interval range, so the second D2D terminal can accurately know the first
  • the D2D terminal transmits the time information of the D2D data, so that accurate reception can be performed.
  • the first D2D terminal sends the I TAI to the second D2D terminal through the PSCCH, which may include: the first D2D terminal adopts downlink timing when transmitting the I TAI through the PSCCH, for example, the first D2D terminal is transmitting.
  • the downlink timing is adopted in the PSCCH because the mode 1 in the D2D communication (that is, the foregoing eNB or the relay node scheduling terminal is used to transmit the data of the direct connection communication data and control information, and is applied to the network coverage or part of the network coverage scenario) when only the first terminal D2D (as an emitter UE) N TA will receive the base station, a second terminal D2D (as the received UE) does not know the N TA.
  • both the transmitting UE and the receiving UE can obtain the downlink timing through the synchronization signal or pilot of the base station. Therefore, in order to ensure that the receiving UE can receive the PSCCH of the transmitting UE, the transmitting UE will transmit the PSCCH with the downlink timing.
  • the first D2D terminal sends the D2D data to the second D2D terminal according to the TA′ and the Ts, so that the second D2D terminal receives the D2D data sent by the first D2D terminal according to the acquired TA′ and Ts.
  • the first D2D terminal may perform D2D data transmission. Specifically, the first D2D terminal sends the second D2D terminal to the second D2D terminal according to TA′ and Ts. D2D data, wherein, for the first D2D terminal and the second D2D terminal, TA' is an accurate and unique value, and the second D2D terminal can perform accurate reception, and Ts is a basic time unit.
  • the second D2D terminal can receive the D2D data sent by the first D2D terminal according to the accurately acquired TA' and Ts, because the second D2D terminal has acquired the TA' adopted by the first D2D terminal.
  • the first D2D terminal sends the D2D data to the second D2D terminal according to the TA' and the Ts, which may include the following steps:
  • the first D2D terminal calculates the D2D data transmission time advance amount according to TA' and Ts as TA' ⁇ Ts;
  • the first D2D terminal sends the D2D data to the second D2D terminal through the PSSCH according to TA' ⁇ Ts.
  • the first D2D terminal calculates the D2D data transmission time advancement amount as TA' ⁇ Ts through TA' and Ts, and the amount of time that the first D2D terminal needs to advance the D2D data in advance is: TA' ⁇ Ts,
  • the first D2D terminal transmits the D2D data by using the PSSCH, and then transmits the D2D data by TA' ⁇ Ts on the PSSCH. For example, the first D2D terminal performs D2D data transmission in advance of TA' ⁇ Ts on the basis of downlink timing.
  • the downlink timing refers to an absolute time point, indicating the arrival time point of the downlink signal
  • the D2D data transmission time advance amount actually refers to the relative time advance amount
  • +TA' ⁇ Ts obtains the transmission time point of D2D data.
  • FIG. 3 a timing relationship diagram of a first D2D terminal transmitting D2D data according to an embodiment of the present invention is provided, wherein a (Physical Downlink Share Channel, PDSCH) subframe representation is a downlink signal sent by a base station to a first D2D terminal.
  • PDSCH Physical Downlink Share Channel
  • the physical uplink shared channel (PUSCH) subframe indicates an uplink signal sent by the first D2D terminal to the base station, and the PUSCH is sent by using an uplink timing (N TA ⁇ Ts), and the first D2D terminal is transmitting.
  • N TA ⁇ Ts uplink timing
  • the first terminal transmits D2D data D2D
  • TA' ⁇ Ts is used, and the D2D subframe should be next to the PUSCH subframe.
  • the use of TA' ⁇ Ts by the first D2D terminal does not affect the transmitting end.
  • the actual D2D data transmission is later than the uplink timing, which may cause the D2D data to interfere with the PUSCH that is normally transmitted later.
  • the design of the D2D subframe a part of the D2D subframe will be vacated and not sent (the length of the blank non-transmission area is greater than 2048 ⁇ Ts), and the maximum value of NTA- TA ' is 512 ⁇ Ts, so TA' is adopted. ⁇ Ts transmission does not affect the sender.
  • the first D2D terminal acquires the I TAI and D2D data transmission advance parameter TA′ according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA , and the first D2D terminal passes the PSCCH.
  • the I TAI is sent to the second D2D terminal, and the second D2D terminal acquires the TA′ according to the received I TAI , and the first D2D terminal sends the D2D data to the second D2D terminal according to the TA′ and the basic time unit Ts, and the second D2D terminal obtains the data according to the acquisition.
  • the received TA2 and Ts receive the D2D data sent by the first D2D terminal, because the second D2D terminal can receive the I TAI sent by the first D2D terminal and acquire the TA′ according to the I TAI , and the first D2D terminal adopts the TA′ and The Ts sends the D2D data, so the second D2D terminal can accurately know the D2D data transmission time advance of the first D2D terminal according to TA' and Ts, and the receiving window of the second D2D terminal can be kept with the D2D data actually sent by the first D2D terminal. It is completely consistent, so that the second D2D terminal can accurately receive the D2D data.
  • the above embodiment introduces the data transmission method of the D2D communication from the first D2D terminal, and then introduces the data transmission method of the D2D communication provided by the embodiment of the present invention from the second D2D terminal.
  • FIG. 4 another implementation of the present invention is shown.
  • the data transmission method of the D2D communication provided by the example may specifically include the following steps:
  • the second D2D terminal receives the time advance indication parameter I TAI sent by the first D2D terminal by using the physical side control channel PSCCH.
  • the first D2D terminal after the first D2D terminal acquires the I TAI , the first D2D terminal sends the I TAI to the second D2D terminal through the PSCCH.
  • the number of bits occupied by the I TAI does not exceed the bit that can be carried by the PSCCH.
  • the first D2D terminal may complete the notification of the I TAI through the PSCCH, and the second D2D terminal receives the I TAI sent by the first D2D terminal through the PSCCH.
  • the first D2D terminal adopts downlink timing when transmitting the PSCCH, and the second D2D terminal can perform reception of the I TAI according to the downlink timing.
  • the second D2D terminal acquires the D2D data transmission advance parameter TA′ according to the received I TAI .
  • the second D2D terminal may acquire the TA′ in the same manner as the first D2D terminal, and the second D2D terminal may obtain the first D2D terminal to send the D2D data.
  • TA' for the second D2D terminal, the TA' is an accurate and unique value, and is not an interval range, so the second D2D terminal can accurately know the time information of the first D2D terminal transmitting the D2D data, thereby Accurate reception is possible.
  • step 402 the second D2D terminal acquires the D2D data transmission advance parameter TA' according to the received I TAI , including:
  • the second D2D terminal calculates TA' by:
  • N is the maximum number of bits occupied by the time advance parameter N TA
  • x is the number of bits occupied by the I TAI .
  • the second D2D terminal acquires the D2D data transmission advance parameter TA' according to the received I TAI , including:
  • the second D2D terminal calculates TA' by:
  • N is the maximum number of bits occupied by the time advance parameter N TA
  • x is the number of bits occupied by I TAI
  • Y is a preset time advance adjustment parameter.
  • the value of N may be 15 or other values, which is determined by the implementation scenario, and the value of x may be 6 or other values, which is determined by the implementation scenario.
  • Y is used as a time adjustment parameter to adjust the value of N TA .
  • the value of Y ranges from 0 to 511.
  • the value of Y can also be selected according to the specific application scenario. Not limited.
  • the second D2D terminal acquires the D2D data transmission advance parameter TA' according to the received I TAI , including:
  • the second D2D terminal queries the corresponding table when the I TAI occupies a different number of bits according to the I TAI , and obtains the TA′ corresponding to the I TAI . Or, obtain the segment range in which the N TA corresponding to the I TAI is located, and use the minimum value of the segment range in which the N TA is located as the acquired TA′.
  • the first D2D terminal and the second D2D terminal both store the foregoing Table 1.
  • the second D2D terminal receives the I TAI sent by the first D2D terminal, and according to the I TAI query table 1, obtains TA'.
  • a second terminal acquired D2D I TAI is 1, the range segment corresponding N TA I TAI is located 256 ⁇ N TA ⁇ 767, the minimum range of the segment 256, the second terminal D2D
  • the obtained TA' is 256.
  • the second D2D terminal receives the D2D data sent by the first D2D terminal according to the acquired TA′ and the basic time unit Ts.
  • the second D2D terminal receives the D2D data sent by the first D2D terminal.
  • the first D2D terminal follows the TA′ and Ts to the second D2D.
  • the terminal transmits D2D data, wherein for both the first D2D terminal and the second D2D terminal, TA' is an accurate and unique value, and the second D2D terminal can use TA' and Ts for accurate reception.
  • the second D2D terminal can receive the D2D data sent by the first D2D terminal according to the accurately acquired TA' and Ts, because the second D2D terminal has acquired the TA' adopted by the first D2D terminal.
  • the second D2D terminal receives the D2D data sent by the first D2D terminal according to the acquired TA' and the basic time unit Ts, and specifically includes the following steps:
  • the second D2D terminal calculates the D2D data transmission time advance amount according to TA' and the basic time unit Ts as TA' ⁇ Ts;
  • the second D2D terminal receives the D2D data sent by the first D2D terminal by using the physical side row shared channel PSSCH according to the TA′ ⁇ Ts.
  • the second D2D terminal calculates the D2D data transmission time advance amount as TA' ⁇ Ts by using TA' and Ts, and the second D2D terminal can accurately know that the first D2D terminal needs to advance the D2D data in advance.
  • TA' ⁇ Ts in step 4032, the second D2D terminal can accurately know that the first D2D terminal transmits the D2D data by using the PSSCH, and can receive the D2D data by using TA' ⁇ Ts in advance on the PSSCH.
  • the first D2D terminal performs D2D data transmission in advance of TA' ⁇ Ts on the basis of downlink timing
  • the second D2D terminal performs reception of D2D data in advance by TA′ ⁇ Ts on the basis of downlink timing.
  • the first D2D terminal acquires the I TAI and D2D data transmission advance parameter TA′ according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA , and the first D2D terminal passes the PSCCH.
  • the I TAI is sent to the second D2D terminal, and the second D2D terminal acquires the TA′ according to the received I TAI , and the first D2D terminal sends the D2D data to the second D2D terminal according to the TA′ and the basic time unit Ts, and the second D2D terminal obtains the data according to the acquisition.
  • the received TA2 and Ts receive the D2D data sent by the first D2D terminal, because the second D2D terminal can receive the I TAI sent by the first D2D terminal and acquire the TA′ according to the I TAI , and the first D2D terminal adopts the TA′ and The Ts sends the D2D data, so the second D2D terminal can accurately know the D2D data transmission time advance of the first D2D terminal according to TA' and Ts, and the receiving window of the second D2D terminal can be kept with the D2D data actually sent by the first D2D terminal. It is completely consistent, so that the second D2D terminal can accurately receive the D2D data.
  • the above embodiment describes a data transmission method for D2D communication according to the present invention.
  • another data transmission method for D2D communication provided by the embodiment of the present invention is introduced.
  • FIG. 5 another embodiment of the present invention provides The data transmission method of the D2D communication may specifically include the following steps:
  • the above embodiment introduces the data transmission method of the D2D communication from the first D2D terminal, and then introduces the data transmission method of the D2D communication provided by the embodiment of the present invention from the second D2D terminal.
  • FIG. 5 another implementation of the present invention is shown.
  • the data transmission method of the D2D communication provided by the example may specifically include the following steps:
  • a first terminal obtains a D2D less than N TA timing advance parameter values, according to the timing advance parameter indicating the number of bits occupied by I TAI and less than N TA timing advance parameter of the acquired I TAI.
  • the first D2D terminal is taken as a transmitting UE as an example.
  • the first D2D terminal first obtains a time advance parameter, and the parameter is represented by N TA , in some embodiments of the present invention.
  • step 501 performs data transmission according to the present invention
  • D2D communication method may further comprise the steps of: obtaining a first base station allocates D2D terminal from a first base station to the terminal D2D N TA.
  • the eNB or the relay node scheduling terminal is used to transmit the data of the direct communication communication and the control information, and is applied to the network coverage or part of the network coverage scenario, and the base station gives each D2D.
  • the terminal configuration time advance parameter N TA , N TA takes a value of 0 ⁇ N TA ⁇ 20512.
  • the first D2D terminal obtains a value smaller than the time advance parameter N TA , for example, the value of the N TA can be reduced, and the N TA value obtained by the value reduction is the value of the obtained time advance parameter N TA , optionally, may reduce the value of a multiple of N TA, i.e.
  • the order of values for N TA narrow on the order of N TA value is then reduced and reduced by the number of bits occupied by the value I TAI N TA acquires I TAI,
  • the I TAI is notified to the second D2D terminal, and the second D2D terminal can determine the N TA with a smaller value range through the I TAI , which can be largely compared to the prior art directly to the N TA segmentation range.
  • the error is reduced, and the receiving precision of the second D2D terminal is improved.
  • the first D2D terminal acquires a value smaller than the time advance parameter N TA , including:
  • the first D2D terminal spares the time advance parameter N TA to obtain the value less than the time advance parameter N TA .
  • the first D2D terminal obtains the I TAI according to the number of bits occupied by the I TAI and the N TA .
  • an implementation manner is that the first D2D terminal passes the following manner. Calculate I TAI :
  • x is the number of bits occupied by I TAI and Z is a preset time adjustment parameter.
  • the value of Z can be from 1 to 14, depending on the implementation scenario.
  • the value of x can be 6 or other values, which is determined by the implementation scenario.
  • the first D2D terminal acquires the I TAI according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA , including:
  • the first D2D terminal calculates the operation intermediate amount N TA ' as follows:
  • N TA ' mod(N TA , 2 Z ),
  • Z is a preset time adjustment parameter
  • the first D2D terminal calculates the I TAI by :
  • x is the number of bits occupied by I TAI and Z is a preset time adjustment parameter.
  • I TAI is calculated according to 'the number of bits occupied by I TAI N TA.
  • the calculation using the parameter I TAI by using 2 Z is N TA to be taken to achieve the remainder, a first terminal and a second D2D D2D terminal have the same preset algorithm modulo, N After the TA is taken, the magnitude of the value is reduced, and then the N TA is segmented based on the magnitude reduction, and the numerical interval error after each segment is reduced. Compared with the prior art, the N TA segmentation is directly compared. The error can be greatly reduced, and the receiving precision of the second D2D terminal is improved.
  • the first D2D terminal sends the I TAI to the second D2D terminal by using the physical side control channel PSCCH, where the I TAI is used by the second D2D terminal to obtain the value range in which the N TA is located.
  • the first D2D terminal after the first D2D terminal acquires the I TAI , the first D2D terminal sends the I TAI to the second D2D terminal through the PSCCH.
  • the number of bits occupied by the I TAI does not exceed the bit that can be carried by the PSCCH.
  • the number range the first D2D terminal can complete the notification of the I TAI through the PSCCH, so the second D2D terminal estimates the N TA adopted by the first D2D terminal after receiving the I TAI as the receiving UE, and for the second D2D terminal, The value range of the N TA is obtained, and the second D2D terminal needs to receive the D2D data according to the value range in which the N TA is located.
  • the first D2D terminal may perform the transmission of the D2D data. Specifically, the first D2D terminal sends the second D2D terminal to the second D2D terminal according to the N TA and the Ts. D2D data, wherein, for the first D2D terminal, the directly adopted N TA is an accurate value, and there is no need to enter other parameters, and the existing protocol standard is smallly changed and compatible for the implementation level. .
  • the second D2D terminal obtains the value range in which the NTA is located according to the received I TAI , and the second D2D terminal can receive the first D2D terminal according to the value range and the Ts where the NTA is located. D2D data.
  • the first D2D terminal acquires the I TAI according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA , and the first D2D terminal sends the I TAI to the second D2D terminal through the PSCCH.
  • the second D2D terminal acquires the value range in which the NTA is located according to the received I TAI , and the first D2D terminal sends the D2D data to the second D2D terminal according to the NTA and the basic time unit Ts, where the second D2D terminal is located according to the NTA
  • the value range and the Ts receive the D2D data sent by the first D2D terminal.
  • the directly used N TA is an accurate value, and no need to go to other parameters to obtain, for the implementation level, the present Some protocol standards have small changes and strong compatibility.
  • the above embodiment introduces the data transmission method of the D2D communication from the first D2D terminal, and then introduces the data transmission method of the D2D communication provided by the embodiment of the present invention from the second D2D terminal.
  • FIG. 6 another implementation of the present invention is shown.
  • the data transmission method of the D2D communication provided by the example may specifically include the following steps:
  • the second D2D terminal receives the time advance indication parameter I TAI sent by the first D2D terminal by using the physical side control channel PSCCH.
  • the first D2D terminal after the first D2D terminal acquires the I TAI , the first D2D terminal sends the I TAI to the second D2D terminal through the PSCCH.
  • the number of bits occupied by the I TAI does not exceed the bit that can be carried by the PSCCH.
  • the first D2D terminal may complete the notification of the I TAI through the PSCCH, and the second D2D terminal receives the I TAI sent by the first D2D terminal through the PSCCH.
  • the first D2D terminal adopts downlink timing when transmitting the PSCCH, and the second D2D terminal can perform reception of the I TAI according to the downlink timing.
  • the second D2D terminal acquires a value range in which the time advance parameter N TA is located according to the received I TAI .
  • the second D2D terminal may backtrack to the value range of the N TA in the same manner as when the first D2D terminal acquires the I TAI , which is an achievable manner. If the second D2D terminal obtains the value range of the time advance parameter N TA according to the received I TAI , the method includes:
  • the second D2D terminal calculates the operation intermediate amount N TA ' where the value range is
  • the second D2D terminal calculates that the value range of the N TA is
  • M is estimated by a Demodulation Reference Signal (DMRS) of the PSSCH.
  • DMRS Demodulation Reference Signal
  • the value range of the M value can be obtained as follows: Where M is an integer greater than or equal to zero.
  • the second D2D terminal calculates the value range in which the NTA is located according to the estimated M value. Specifically, the second D2D terminal may use the endpoint value or the intermediate value or a value in the range of the value range in which the NTA is located. As the estimated N TA , the received D2D data sent by the first D2D terminal is received according to the estimated N TA and Ts.
  • the second D2D terminal receives the D2D data sent by the first D2D terminal according to the value range and the basic time unit Ts where the acquired NTA is located.
  • the second D2D terminal after the second D2D terminal acquires the value range in which the NTA is located according to the I TAI , the second D2D terminal receives the D2D data sent by the first D2D terminal. Specifically, the second D2D terminal may use the NTA. The value range and Ts are received.
  • step 603 the second terminal Ts D2D D2D D2D data terminal receives a first transmission range and according to a basic time unit of the acquired N TA is located, comprising:
  • the calculation using the parameter I TAI by using 2 Z is N TA to be taken to achieve the remainder, a first terminal and a second D2D D2D terminal have the same preset algorithm modulo, N
  • the value of the N TA ' value obtained after the TA is taken is smaller than that of N TA , and then segmented based on the N TA ' of the magnitude reduction, and the numerical interval error after each segment is reduced, which is directly compared with the prior art.
  • the segmentation of the N TA can greatly reduce the error and improve the reception accuracy of the second D2D terminal.
  • the receiving UE after the receiving UE acquires an I TAI , it may be determined that the value of the transmission timing N TA will be 512 ⁇ Ts.
  • the first D2D terminal acquires the I TAI according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA , and the first D2D terminal sends the I TAI to the second D2D terminal through the PSCCH.
  • the second D2D terminal acquires the value range in which the NTA is located according to the received I TAI , and the first D2D terminal sends the D2D data to the second D2D terminal according to the NTA and the basic time unit Ts, where the second D2D terminal is located according to the NTA and a first reception range Ts D2D D2D data sent by the terminal, there is a small error in the range N TA used by a second terminal located D2D, reception performance also improved significantly.
  • FIG. 7 is a schematic diagram of an interaction process between a first D2D terminal, a second D2D terminal, and a base station according to an embodiment of the present invention.
  • the following communication mode exists in the D2D communication as an example: an eNB or a relay node.
  • the scheduling terminal is configured to transmit the data of the direct connection communication data and the control information, and is applied to a scenario covered by the network coverage or part of the network coverage.
  • the base station sends a system information block (SIB) to the first D2D terminal and the second D2D terminal, and the base station sends the scheduling allocation, the data resource and the format to the first D2D through a downlink control channel (Physical Downlink Control Channel, PDCCH).
  • SIB system information block
  • PDCCH Physical Downlink Control Channel
  • the manner in which the first D2D terminal determines the I TAI and the TA′ may be as follows:
  • the table 2 is obtained by the formula under the scenario 1, and the first D2D terminal will use 6 bits to indicate the I TAI , wherein the I TAI value is from the following Table 2, and the N is in Table 2 15.
  • the first D2D terminal will indicate that the timing advance of the D2D transmission is TA' ⁇ Ts, and TA' ⁇ Ts will be used for the advance amount of transmission.
  • Table 2 A side reception timing adjustment indication mapping table
  • the manner in which the first D2D terminal determines the I TAI and the TA′ may be as follows:
  • the table 3 is obtained by the formula under the scenario 3, and the first D2D terminal will use 6 bits to indicate the I TAI , wherein the value of the I TAI is from the following Table 3, wherein For example, where N is 15 and x is 6, the first D2D terminal will indicate that the timing advance of the D2D transmission is TA' ⁇ Ts, and TA' ⁇ Ts will be used for the advance amount of transmission.
  • Table 3 A side-receive timing adjustment indication mapping table
  • the manner in which the first D2D terminal determines the I TAI may be as follows:
  • N TA ' mod(N TA ,2048),
  • the table 4 is obtained by the formula under the scenario 5, and the first D2D terminal will use 6 bits to indicate the I TAI , wherein the value of the I TAI is from the following Table 4, wherein For example, where x is 6, the first D2D terminal will indicate that the timing advance of the D2D transmission is N TA ⁇ Ts and will be used.
  • N TA ⁇ Ts is the amount of advance to send.
  • Table 4 A side-receive timing adjustment indication mapping table
  • the manner in which the first D2D terminal determines the I TAI may be as follows:
  • N TA ' mod(N TA ,1024)
  • the table 5 is obtained by the formula under the scenario 7, and the first D2D terminal will use 6 bits to indicate the I TAI , wherein the value of the I TAI is from the following Table 5, wherein For example, where x is 6, the first D2D terminal will indicate that the timing advance of the D2D transmission is N TA ⁇ Ts and will be used.
  • N TA ⁇ Ts is the amount of advance to send.
  • Table 5 A side-receive timing adjustment indication mapping table
  • the manner in which the first D2D terminal determines the I TAI may be as follows:
  • N TA ' mod(N TA ,16384)
  • the second D2D terminal determines the value range in which the N TA is located as follows:
  • N TA M ⁇ 2048 + N TA '
  • N TA M ⁇ 1024 + N TA '
  • the second D2D terminal needs to perform M estimation according to the DMRS of the PSSCH to obtain the interval in which the actual M value is located. Therefore, when the estimate of M is obtained, the second D2D terminal will obtain a more accurate range of values of the actual N TA .
  • the receiving UE after the receiving UE acquires an I TAI , it may be determined that the value of the transmission timing N TA will be 512 ⁇ Ts.
  • the receiving UE obtains an I TAI , and after estimating the value of M, it can be determined that the value of the transmission timing N TA will have 32 ⁇ Ts.
  • the receiving UE obtains an I TAI , and after estimating the value of M, it can be determined that the value of the transmission timing N TA will have 16 ⁇ Ts.
  • a D2D terminal 800 is provided in the embodiment of the present invention.
  • the D2D terminal is specifically a first D2D terminal, and may include: an obtaining module 801, a notification module 802, and a data sending module 803.
  • the obtaining module 801 is configured to acquire the I TAI and D2D data transmission advance parameter TA′ according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA ;
  • the notification module 802 is configured to send the I TAI to the second D2D terminal by using the physical side control channel PSCCH, so that the second D2D terminal acquires the TA′ according to the received I TAI ;
  • a data sending module 803 configured to send D2D data to the second D2D terminal according to the TA' and the basic time unit Ts, so that the second D2D terminal receives the station according to the acquired TA' and the Ts
  • the D2D data sent by the first D2D terminal is described.
  • the obtaining module 801 configured to obtain the I TAI the number of bits occupied by the I TAI and the N TA, and using the I TAI and the occupancy N TA The maximum number of bits acquires the TA', or uses the minimum value of the segment range in which the NTA is located as the acquired TA'.
  • the obtaining module 801 is specifically configured to: according to the NTA, query the corresponding table when the I TAI occupies a different number of bits, and obtain the I TAI and the location corresponding to the N TA Said TA'.
  • the obtaining module 801 is specifically configured to calculate the I TAI by :
  • the obtaining module 801 is specifically configured to calculate the I TAI by :
  • the TA' is calculated by:
  • the N is the maximum number of bits occupied by the N TA
  • the x is the number of bits occupied by the I TAI
  • the Y is a preset time advance adjustment parameter.
  • the value of Y ranges from 0 to 511.
  • the number of bits occupied by the I TAI is 6 bits.
  • the obtaining module 801 is further configured to acquire the base station allocates the first D2D N TA to the terminal from the base station.
  • the data sending module 801 includes:
  • a calculation submodule configured for the first D2D terminal to calculate a D2D data transmission time advance according to the TA′ and the Ts as TA′ ⁇ Ts;
  • a sending submodule configured to send D2D data to the second D2D terminal by using the physical side row shared channel PSSCH according to the TA′ ⁇ Ts.
  • the first D2D terminal acquires the I TAI and D2D data transmission advance parameter TA′ according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA , and the first D2D terminal passes the PSCCH.
  • the I TAI is sent to the second D2D terminal, and the second D2D terminal acquires the TA′ according to the received I TAI , and the first D2D terminal sends the D2D data to the second D2D terminal according to the TA′ and the basic time unit Ts, and the second D2D terminal obtains the data according to the acquisition.
  • the received TA2 and Ts receive the D2D data sent by the first D2D terminal, because the second D2D terminal can receive the I TAI sent by the first D2D terminal and acquire the TA′ according to the I TAI , and the first D2D terminal adopts the TA′ and The Ts sends the D2D data, so the second D2D terminal can accurately know the D2D data transmission time advance of the first D2D terminal according to TA' and Ts, and the receiving window of the second D2D terminal can be kept with the D2D data actually sent by the first D2D terminal. It is completely consistent, so that the second D2D terminal can accurately receive the D2D data.
  • a D2D terminal 900 is provided in the embodiment of the present invention.
  • the D2D terminal is specifically a second D2D terminal, and may include: an information receiving module 901, an obtaining module 902, and a data receiving module 903.
  • the information receiving module 901 is configured to receive, by using the physical side control channel PSCCH, a time advance indication parameter I TAI sent by the first D2D terminal;
  • the obtaining module 902 is configured to acquire a D2D data sending advance parameter TA′ according to the received I TAI ;
  • the data receiving module 903 is configured to receive the D2D data sent by the first D2D terminal according to the acquired TA′ and the basic time unit Ts.
  • the obtaining module 902 is specifically configured to calculate the TA′ by:
  • the N is the maximum number of bits occupied by the time advance parameter N TA
  • the x is the number of bits occupied by the I TAI .
  • the obtaining module 902 is specifically configured to calculate the TA′ by:
  • the N is the maximum number of bits occupied by the time advance parameter N TA
  • the x is the number of bits occupied by the I TAI
  • the Y is a preset time advance adjustment parameter.
  • the value of Y ranges from 0 to 511.
  • the x is 6 bits.
  • the obtaining module 902 configured to occupy different time corresponding to the number of bits according to the table I TAI I TAI query to obtain the TA corresponding to the I TAI '. Or, to obtain the range of the segment corresponding to N TA I TAI, and using a minimum value of the range of the segment is located as N TA to the acquired TA '.
  • the data receiving module 903 includes:
  • a calculation submodule configured to calculate, according to the TA′ and the basic time unit Ts, a D2D data transmission time advance amount is TA′ ⁇ Ts;
  • the receiving submodule is configured to receive the D2D data sent by the first D2D terminal by using the physical side row shared channel PSSCH according to the TA′ ⁇ Ts.
  • the first D2D terminal acquires the I TAI and D2D data transmission advance parameter TA′ according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA , and the first D2D terminal passes the PSCCH.
  • the I TAI is sent to the second D2D terminal, and the second D2D terminal acquires the TA′ according to the received I TAI , and the first D2D terminal sends the D2D data to the second D2D terminal according to the TA′ and the basic time unit Ts, and the second D2D terminal obtains the data according to the acquisition.
  • the received TA2 and Ts receive the D2D data sent by the first D2D terminal, because the second D2D terminal can receive the I TAI sent by the first D2D terminal and acquire the TA′ according to the I TAI , and the first D2D terminal adopts the TA′ and The Ts sends the D2D data, so the second D2D terminal can accurately know the D2D data transmission time advance of the first D2D terminal according to TA' and Ts, and the receiving window of the second D2D terminal can be kept with the D2D data actually sent by the first D2D terminal. It is completely consistent, so that the second D2D terminal can accurately receive the D2D data.
  • a D2D terminal 1000 is provided in the embodiment of the present invention.
  • the D2D terminal is specifically a first D2D terminal, and may include: an obtaining module 1001, a notification module 1002, and a data sending module 1003.
  • Obtaining module 1001 configured to obtain a parameter value is less than N TA timing advance, the timing advance parameter I TAI indicating the number of bits occupied by the timing advance parameter is less than the value N TA I TAI according to the acquired;
  • the notification module 1002 is configured to send, by using the physical side control channel PSCCH, the I TAI to the second D2D terminal, where the I TAI is used by the second D2D terminal to obtain a value range in which the N TA is located;
  • Data transmitting module 1003 configured to transmit Ts D2D D2D data to the second terminal according to the N TA and the basic time unit, so that the second range D2D terminal according to the acquired location and N TA The Ts receives D2D data sent by the first D2D terminal.
  • a specific value of the timing advance parameter to obtain said modulo N TA timing advance parameter is less than the N TA.
  • the obtaining module 1001 is specifically configured to calculate the I TAI by :
  • the x is the number of bits occupied by the I TAI
  • the Z is a preset time adjustment parameter.
  • the Z ranges from 1 to 14.
  • the number of bits occupied by the I TAI is 6 bits.
  • the first D2D terminal acquires the I TAI according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA , and the first D2D terminal sends the I TAI to the second D2D terminal through the PSCCH.
  • the second D2D terminal acquires the value range in which the NTA is located according to the received I TAI , and the first D2D terminal sends the D2D data to the second D2D terminal according to the NTA and the basic time unit Ts, where the second D2D terminal is located according to the NTA
  • the value range and the Ts receive the D2D data sent by the first D2D terminal.
  • the directly used N TA is an accurate value, and no need to go to other parameters to obtain, for the implementation level, the present Some protocol standards have small changes and strong compatibility.
  • a D2D terminal 1100 is provided in the embodiment of the present invention.
  • the D2D terminal is specifically a second D2D terminal, and may include: an information receiving module 1101, an obtaining module 1102, and a data receiving module 1103.
  • the information receiving module 1101 is configured to receive, by using the physical side control channel PSCCH, a time advance indication parameter I TAI sent by the first D2D terminal;
  • the obtaining module 1102 is configured to obtain a value range in which the time advance parameter N TA is located according to the received I TAI ;
  • the data receiving module 1103 is configured to receive the D2D data sent by the first D2D terminal according to the obtained value range and the basic time unit Ts where the NTA is located.
  • the obtaining module 1102 configured in accordance with the range where the N TA multiplied by the Ts D2D D2D terminal receives the first transmission line side through a physical shared channel PSSCH data.
  • the obtaining module 1102 is specifically configured to calculate a value range of the operation intermediate quantity N TA ' as N TA ' ⁇ [I TAI ⁇ 2 Zx , (I TAI +1) ⁇ 2 Zx -1]:
  • the acquiring module 1102 is further configured to obtain the M by using a demodulation reference signal DMRS of the PSSCH.
  • the first D2D terminal acquires the I TAI according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA , and the first D2D terminal sends the I TAI to the second D2D terminal through the PSCCH.
  • the second D2D terminal acquires the value range in which the NTA is located according to the received I TAI , and the first D2D terminal sends the D2D data to the second D2D terminal according to the NTA and the basic time unit Ts, where the second D2D terminal is located according to the NTA and a first reception range Ts D2D D2D data sent by the terminal, there is a small error in the range N TA used by a second terminal located D2D, reception performance also improved significantly.
  • the embodiment of the present invention further provides a computer storage medium, wherein the computer storage medium stores a program, and the program executes some or all of the steps described in the foregoing method embodiments.
  • the D2D terminal 1200 is specifically a first D2D terminal, and includes:
  • the input device 1201, the output device 1202, the processor 1203, and the memory 1204 (wherein the number of the processors 1203 in the first D2D terminal 1200 may be one or more, and one processor in FIG. 12 is taken as an example).
  • the input device 1201, the output device 1202, the processor 1203, and the memory 1204 may be connected by a bus or other means, wherein the bus connection is taken as an example in FIG.
  • the processor 1203 is configured to perform the following steps:
  • the processor 1203 is configured to perform the acquiring the I TAI and D2D data transmission advance parameter TA' according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA , including:
  • the processor 1203 is configured to perform the acquiring the I TAI and D2D data transmission advance parameter TA′ according to the number of bits occupied by the time advance indication parameter I TAI and the time advance parameter N TA , including:
  • the processor 1203 is specifically configured to perform acquiring the I TAI according to the number of bits occupied by the I TAI and the N TA , including:
  • the I TAI is calculated by:
  • the N is the maximum number of bits occupied by the N TA
  • the x is the number of bits occupied by the I TAI ;
  • the processor 1203 is configured to perform, by using the maximum number of bits occupied by the I TAI and the N TA , to obtain the TA′, including:
  • the TA' is calculated by:
  • the N is the maximum number of bits occupied by the N TA
  • the x is the number of bits occupied by the I TAI .
  • the processor 1203 is specifically configured to perform acquiring the I TAI according to the number of bits occupied by the I TAI and the N TA , including:
  • the I TAI is calculated by:
  • the N is the maximum number of bits occupied by the N TA
  • the x is the number of bits occupied by the I TAI
  • the Y is a preset time advance adjustment parameter
  • the processor 1203 is configured to perform, by using the maximum number of bits occupied by the I TAI and the N TA , to obtain the TA′, including:
  • the TA' is calculated by:
  • the N is the maximum number of bits occupied by the N TA
  • the x is the number of bits occupied by the I TAI
  • the Y is a preset time advance adjustment parameter.
  • the value of the Y stored by the memory 1204 ranges from 0 to 511.
  • the number of bits occupied by the I TAI stored by the memory 1204 is 6 bits.
  • the processor 1203 is further configured to perform steps comprising: obtaining the base station allocates the first D2D N TA to the terminal from the base station.
  • the processor 1203 is specifically configured to perform sending the D2D data to the second D2D terminal according to the TA′ and the basic time unit Ts, including:
  • the processor 1203 is configured to perform the following steps:
  • the timing advance parameter indicates the number of bits occupied by I TAI according to the parameter value N is smaller than the timing advance TA acquire the I TAI;
  • the processor 1203, particularly for the timing advance parameter to obtain said modulo N TA timing advance parameter is less than the value of N TA.
  • the processor 1203, particularly for performing obtaining a parameter N TA is smaller than the timing advance value, according to the timing advance parameter indicating the number of bits occupied by I TAI and the parameter value is smaller than the timing advance of N TA
  • Obtaining the I TAI includes:
  • the I TAI is calculated by:
  • the x is the number of bits occupied by the I TAI
  • the Z is a preset time adjustment parameter.
  • the processor 1203, particularly for performing obtaining a parameter N TA is smaller than the timing advance value, according to the timing advance parameter indicating the number of bits occupied by I TAI and the parameter value is smaller than the timing advance of N TA
  • Obtaining the I TAI includes:
  • the calculation intermediate amount N TA ' is calculated as follows:
  • N TA ' mod(N TA , 2 Z ),
  • the Z is a preset time adjustment parameter
  • the processor 1203 is specifically configured to perform calculating the I TAI by :
  • the x is the number of bits occupied by the I TAI
  • the Z is a preset time adjustment parameter.
  • the Z stored by the memory 1204 ranges from 1 to 14.
  • the number of bits occupied by the I TAI stored by the memory 1204 is 6 bits.
  • the D2D terminal 1300 is specifically a second D2D terminal, and includes:
  • the input device 1301, the output device 1302, the processor 1303, and the memory 1304 (wherein the number of the processors 1303 in the second D2D terminal 1300 may be one or more, and one processor in FIG. 13 is taken as an example).
  • the input device 1301, the output device 1302, the processor 1303, and the memory 1304 may be connected by a bus or other means, wherein the bus connection is taken as an example in FIG.
  • the processor 1303 is configured to perform the following steps:
  • the processor 1303 is configured to perform, according to the received I TAI, the D2D data sending advance parameter TA′, including:
  • the TA' is calculated by:
  • the N is the maximum number of bits occupied by the time advance parameter N TA
  • the x is the number of bits occupied by the I TAI .
  • the processor 1303 is configured to perform, according to the received I TAI, the D2D data sending advance parameter TA′, including:
  • the TA' is calculated by:
  • the N is the maximum number of bits occupied by the time advance parameter N TA
  • the x is the number of bits occupied by the I TAI
  • the Y is a preset time advance adjustment parameter.
  • the value of Y stored by the memory 1304 ranges from 0 to 511.
  • the x stored by the memory 1304 is 6 bits.
  • the processor 1303 is configured to perform, according to the received I TAI, the D2D data sending advance parameter TA′, including:
  • I TAI query according to the time corresponding to the number of bits occupied by different table I TAI to obtain the corresponding one of the I TAI TA '; or,
  • the processor 1303 is configured to perform, according to the acquired the TA' and the basic time unit Ts, the D2D data sent by the first D2D terminal, including:
  • the D2D data sent by the first D2D terminal is received by the physical side row shared channel PSSCH according to the TA' ⁇ Ts.
  • the processor 1303 is configured to perform the following steps:
  • the processor 1303 is configured to perform, according to the obtained value range and the basic time unit Ts where the NTA is located, the D2D data sent by the first D2D terminal, including:
  • the processor 1303 is configured to perform a value range in which the time advance parameter N TA is obtained according to the received I TAI , including:
  • the M stored by the memory 1304 is estimated by the demodulation reference signal DMRS of the PSSCH.
  • the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be Physical units can be located in one place or distributed to multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • the connections between the modules The relationship indicates that there is a communication connection between them, and specifically can be implemented as one or more communication buses or signal lines. Those of ordinary skill in the art can understand and implement without any creative effort.
  • the present invention can be implemented by means of software plus necessary general hardware, and of course, dedicated hardware, dedicated CPU, dedicated memory, dedicated memory, Special components and so on.
  • functions performed by computer programs can be easily implemented with the corresponding hardware, and the specific hardware structure used to implement the same function can be various, such as analog circuits, digital circuits, or dedicated circuits. Circuits, etc.
  • software program implementation is a better implementation in more cases.
  • the technical solution of the present invention which is essential or contributes to the prior art, can be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer.
  • U disk mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., including a number of instructions to make a computer device (may be A personal computer, server, or network device, etc.) performs the methods described in various embodiments of the present invention.
  • a computer device may be A personal computer, server, or network device, etc.

Abstract

La présente invention concerne un procédé et un terminal d'émission de données pour une communication D2D. Le procédé peut comprendre les étapes suivantes : un premier terminal D2D acquiert, en fonction d'un nombre de bits occupés par un paramètre d'indication d'avance temporelle ITAI et un paramètre d'indication d'avance temporelle NTA, l'ITAI et un paramètre d'avance d'envoi de données D2D TA' ; le premier terminal D2D envoie l'ITAI à un second terminal D2D par l'intermédiaire d'un canal de commande physique de liaison latérale (PSCCH), de sorte que le second terminal D2D acquière le TA' en fonction de l'ITAI reçu ; et le premier terminal D2D envoie, en fonction du TA' et d'une unité temporelle de base Ts, des données D2D au second terminal D2D, de sorte que le second terminal D2D reçoive les données D2D envoyées par le premier terminal D2D en fonction du TA' acquis et de la Ts.
PCT/CN2015/072015 2015-01-30 2015-01-30 Procédé et terminal d'émission de données pour communication d2d WO2016119241A1 (fr)

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